mobile

Battery was getting tired, so I ordered a replacement -- and installed it yesterday afternoon..
The phone worked normally -- until this morning.
I noticed a notification from my text app that it couldn't connect and that I should check my settings.
I went to settings and began by refreshing the PRL. During that process the phone froze and then went dead.
Totally dead.
So, I opened it up again to check the battery terminal connection -- and I believe it WAS loose -- so I reconnected it and checked it. Phone goes on!
But it only goes to the splash screen and then repeats. No boot animation.
It will go to the bootloader, but not boot the system nor recovery from there.
Using the fastboot commands, I re-flashed bootloader, radio, boot, system, (From 5.1 stock image) TWRP recovery and erased the cache.
Still stuck at the Google splash screen.
Anyone care to point me in a better direction?